Set an example by putting away your own groceries as soon as you put them in the kitchen. Boom 5k saved.
Maybe they will grow up to not be the type of person who leaves all of their crap on the table of the university table after they are done studying.
To be clear: I am not shifting on you as a parent. I am making fun of owning robots to do the specific things you mentioned. Obviously if you are immobile in some sense it would be great to have a cleaning robot